How to hide the "No Client" and "Any Client" options in Timesheets?

Hello! Maybe these options were added recently, or maybe I just hadn't noticed them prior, but when filling out a Timesheet, I notice that "No Client" and "Any Client" are options above the list of active clients.I would like to hide these two options for me and all of users. In other words, I want to force them to choose a particular client from the list.

We understand the requirement however, this is something that is available for the ease of access. It makes it easier for the users to choose the projects in case they aren't sure of the client. Additionally, irrespective of whether the user selects Any Client or No Client, the moment the project is selected, the client association will be done automatically.